Description

In the Linux kernel, the following vulnerability has been resolved:

x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer()

The code calling ima_free_kexec_buffer() runs long after the memblock
allocator has already been torn down, potentially resulting in a use
after free in memblock_isolate_range().

With KASAN or KFENCE, this use after free will result in a BUG
from the idle task, and a subsequent kernel panic.

Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid
that bug.

Classification

CVE ID: CVE-2023-52576

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.83% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/eef16bfdb212da60f5144689f2967fb25b051a2b
https://git.kernel.org/stable/c/d2dfbc0e3b7a04c2d941421a958dc31c897fb204
https://git.kernel.org/stable/c/34cf99c250d5cd2530b93a57b0de31d3aaf8685b

Timeline